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An electric ignition device for an internal combustion engine having a primary and a secondary circuit coupled together by a transformer. The secondary circuit includes a spark gap. The primary circuit includes a capacitor that can be discharged. The voltage discharged by the capacitor is coupled by

An electric ignition device for an internal combustion engine having a primary and a secondary circuit coupled together by a transformer. The secondary circuit includes a spark gap. The primary circuit includes a capacitor that can be discharged. The voltage discharged by the capacitor is coupled by the transformer to the secondary circuit where it produces an ignition spark across the spark gap. The primary circuit is a resonant circuit that is repeatedly excited keeping the ignition spark burning as an arc. Current or voltage in the secondary circuit are detected to control the energy introduced into the spark gap.

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[ What is claimed is:] [1.] An electric ignition device, in particular for internal combustion engines, comprising:a primary circuit, electrically connected as a resonant circuit, including a capacitor, a coil, and a control device;a secondary circuit, including a spark plug for igniting a fuel-air

[ What is claimed is:] [1.] An electric ignition device, in particular for internal combustion engines, comprising:a primary circuit, electrically connected as a resonant circuit, including a capacitor, a coil, and a control device;a secondary circuit, including a spark plug for igniting a fuel-air mixture;a charging device for charging the capacitor to a predetermined charging voltage;a transformer for transmitting an electric igniting pulse generated by discharging the capacitor from the primary circuit into the secondary circuit; anda device for detecting the current (I.sub.S) or the voltage (U.sub.1) in the secondary circuit, wherein the resonant circuit is repeatedly excitable in order to keep burning as an arc an ignition spark produced by discharging the capacitor, and further wherein, the current (I.sub.S) or an energy flow introduced into the secondary circuit is controlled to an approximately constant value in accordance with the detected current (I.sub.S) or the detected voltage (U.sub.1) by the control device.